I've installed QWT 6.1.0 over a Qt 5.0.1. It installed correctly, but I have one problem with QWT Designer plugin: when I accessing QtDesigner separatly it works correct. But when I trying to use it inside a Creator it don't works: there is no qwt widgets in a form, althogh it builds correctly and widgets are displaying on a runtime.
Next system variables are set:
QT_PLUGIN_PATH = C:\Qwt-6.1.0\plugins
QMAKEFEATURES = C:\Qwt-6.1.0\features
In "Tools->Form Editor->QtDesigner Plugins" it is written that creator can't find necessary [rocedure
The reason might be on the compatibility of your QTCreator with the the ACTUAL QT framework you built QWT against.
The "Qt 5.1.1 for Windows 64-bit (VS 2012, OpenGL, 522 MB)" package provided in QT-Project.org/Download has the QT libraries built against MSVCR110 (C++ 2012) 64 bits where as the actual QTCreator.exe is built against MSCVR100 (C++ 2010). That's why the QWT plugin load successfully form the stand-alone QT Designer that comes in the QT framework, but not on the QT creator that comes in the Tools/ directory. To check this, load the QTCreator executable in Dependency Walker and you'll see.
My recommendation is that you download the source code of QT, build it with your compiler and then compile the QWT using the same compiler. A bit tedious but at least you'll be sure that your plugins will load.
Related
Although I chose to install source code when installing Qt, I could not find the source code for Qt Creator in the Src directory. Isn't the source code for Qt Creator included in Qt source? Isn't Qt Creator part of Qt?
Qt and Qt Creator are both developed inside the Qt Project, but are still two separate projects. Qt Creator depends on Qt, but not the other way around, one can use Qt perfectly fine without Qt Creator. They are released independently and with different versioning.
The "sources” package in the Qt installer refers to the Qt source code only, not to Qt Creator. In the installer you’re offered different versions of Qt, all with their own “sources” packages, but only one Qt Creator (the latest one).
You can find the Qt Creator source code in the Qt Download section (the source code archives end in .tar.xz/.tar.gz/.zip) or in the Git repository.
I need to add some huge classes (non-GUI) that use CString, CArray etc. to my Qt project on Windows, but I am not sure how to use MFC outside of Visual Studio, via Qt Creator QMake (with VS 2017 compiler).
What libraries do I need to link for that?
I found some examples for CMake that use built-in CMAKE_MFC_FLAG but not much information about QMake.
I'm trying to learn how to use Qt for dev and have to say it's been a pain from the start.
I installed Qt Creator 5.4 version. Then followed this http://qt-project.org/wiki/Qt_for_beginners_Hello_World.
It defaulted to MSVS so I manually added MinGw. It has a red sign next to it saying that MinGW cannot compile code for the QT version.
I just want to use Qt5 and need an appropriate compiler for it. I'm used to using MinGW in Eclipse for C++ dev.
Your installation seems to be incomplete or inconsistent.
To work with Qt you actually need two things: One is a compiler toolchain (called the "kit" in Qt Creator), the other is the compiled Qt library, which is what is visible in settings under "Qt versions". Both need to fit together for Qt to work.
In case you want to use Qt with Visual Studio, you should select the precompiled Qt version corresponding to your (previously installed) VS version during install when you use the online installer. Or use the offline installer for your VS version. After install, everything finds together itself.
Or you want to use MinGW. Do yourself a favor and use the MinGW version which is installed by the Qt installer, which is different to the one from MinGW.org (it is the 32 bit version of the MinGW-w64 project, which is more up to date than the one from MinGW.org, and has some other subtleties). It is selectable in the installer under "tools". Additionally select the Qt version precompiled with MinGW. After install, select the MinGW Kit for your new project, and everything again will work from scratch. Again, you can use either the offline installer including MinGW-precompiled Qt or the online-installer which has all versions of precompiled selectable to perform that installation.
Questions:
Is Qt Creator built with Qt Creator?
Similarly, is Qt Designer built with Qt Designer?
BTW, why are there two Qt IDEs? Are they competitors? Which one should I use? I am using Creator.
What is Qt SDK? I am asking this because the Qt Designer & Creator 2.2.1 and Qtmake 4.7.4 that I installed thro ubuntu 11.10 s/w centre does not work. The build menu is all greyed out.
When I downloaded the latest QtSDK (2.3.1/4.7.4) into a separate installation into /opt/QtSDK, both the ubuntu sanctioned installation and the /opt/QtSDK would work as expected.
Why did my ubuntu sanctioned installation not work without the SDK? What does the SDK do?
This one is for Ubuntu enthusiasts - Qt IDE requires the SDK to work, and yet ubuntu released both Creator/Designer without checking if they work first? There is no QtSDK installation item in s/w centre. Is that intentional, or a procedural bug?
After I build my desktop app (I am building a tabbed file explorer) on Linux, what steps do I need to make to have it running on Windows 7/Vista? Will I rebuild on a windows version of Qt Creator?
I also notice that Qt Creator code generation is not perfect. It would forget to include some Qt library files in the auto-generated code, and I had to correct that manually.
Is Qt Creator built with Qt Creator?
I believe so.
That doesn't mean that everyone who works on Qt has to use it - just that I believe that lots of people do.
I don't work for any of the companies that have produced Qt, but my reasoning is:
A Google search for "dogfooding qt creator" brings up plenty of hits, including this comment from November 2010:
We’re also “dogfooding” by releasing complex apps like Qt Creator and the Ovi Suite on the desktop ports of Qt
They've put a massive amount of effort into Qt Creator over the last few years. It's hard to imagine that being worthwhile, unless they used it themselves
At recent Qt Developer Days, Qt Developers have spoken really enthusiastically about Qt Creator
Similarly, is Qt Designer built with Qt Designer?
Yes. A look at the Qt Designer source code shows plenty of .ui (Designer) files.
Why are there two Qt IDEs? Are they competitors? Which one should I use? I am using Creator.
When you edit .ui files insiide Qt Creator, you are still running Qt Designer: it's simply showing the Designer window inside Creator, for convenience.
What is Qt SDK? ... What does the SDK do?
Qt SDK is just a convenient way to download all the Qt tools in one go. You don't have to use it.
This one is for Ubuntu enthusiasts ... Is that intentional, or a procedural bug?
Sorry - no idea. It's hard to imagine it being intentional though.
After I build my desktop app (I am building a tabbed file explorer) on Linux, what steps do I need to make to have it running on Windows 7/Vista? Will I rebuild on a windows version of Qt Creator?
You will need to install Qt on a Windows PC, and then build your source code in it.
You can either do that by using Qt Creator and the Windows compiler it includes (mingw) or you can use another compiler, if you have one, e.g. Visual Studio.
I also notice that Qt Creator code generation is not perfect. It would forget to include some Qt library files in the auto-generated code, and I had to correct that manually.
If you've used any non-Qt classes in arguments to signals and slots, then this answer may help you there.
We're trying to compile a project with MinGW on the machine that has both MinGW (with Qt) and Visual Studio installed. Unfortunately, Qt creator prefers MSVS by default, and doesn't see it's very own MinGW (screenshot). Sadly, this results in a lot of obscure errors, because application was written and debugged with MinGW. Is there way to make Qt Creator to use MinGW without killing MSVS?
While installing, choose custom type of installation. Selected libraries for needed compilers in QtSDK->Development Tools->Desktop Qt->Qt-. Screenshot:
Have you made sure your Qt sdk is installed with its MinGW? You can use the Qt maintainance app to make sure its MinGW engine is installed.
Where are those libraries from? Did you compile the SDK yourself? Or did you downloded the libraries?
Try to see what is in the mkspecs directory. There should be a link named 'default'. That links to the specification which is being used. I suppose it is pointing to win32-msvc2008. You can change that but if it is pointing to that specification it means that the Qt libraries have been compiled with that specification (unless it was changed afterwards), which means you cannot use those with MinGW. You should compile the libraries with the correct specification or download the correct package (MinGW version).